Indeed, although it takes two to tango. Impossible to know the relationship between said person and their management. I take my inklings to start new things while employed as an indicator that I need to talk to my manager. Help doing more work should be a good request, and 'in a month' or so is an acceptable answer. If they don't help me out I start feeling restless and perhaps start that project on the weekend. If they don't respond to my progress then I start feeling unappreciated/underutilized, and express this. If it still goes nowhere, time to move on. Not moving on at this point is where the problems start, as you go into a reactionary mode and "aren't yourself" anymore.